Solubility and Solubility Product Determination of a Sparingly Soluble Salt: A First-Level Laboratory Experiment

A simple experiment was devised to let students determine the solubility and solubility product, K sp, of calcium sulfate dihydrate in a first-level laboratory. The students experimentally work on an intriguing equilibrium law: the constancy of the product of the ion concentrations of a sparingly so...

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Bibliographic Details
Published in:Journal of chemical education 2012-03, Vol.89 (4), p.545-547
Main Authors: Bonomo, Raffaele P, Tabbì, Giovanni, Vagliasindi, Laura I
Format: Article
Language:English
Subjects:
Calcium
Calcium sulfate
Calcium sulfate dihydrate
Chemical precipitation
Chemistry
College Science
Ions
Laboratory Experiments
Reagents
Science Experiments
Scientific Concepts
Solubility
Students
Undergraduate Study
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Summary:A simple experiment was devised to let students determine the solubility and solubility product, K sp, of calcium sulfate dihydrate in a first-level laboratory. The students experimentally work on an intriguing equilibrium law: the constancy of the product of the ion concentrations of a sparingly soluble salt. The determination of solubility is proposed either in an equimolar precipitation of CaSO4·2H2O, from which the K sp is obtained, or working with an excess of one of the two reagents.
ISSN:0021-9584
1938-1328
DOI:10.1021/ed2003143